Rifle
The rifle was the main weapon used by the British in WWI. 15 rounds could be fired in a minute and a person 1,400 meters away could be shot and killed.
Torpedoes
Torpedoes were used by submarines. The Germans used used torpedoes to blow up ships carrying supplies from America to Britain.
Tanks
Tanks were used for the first time in WWI at the Battle of the Somme. They were developed to handle the conditions on the Western Front. Its maximum speed was 3mph.